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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4050cbcadc4791fae055bfb418baf0b4622ccad891ac697750061a307e5df21b' 
  AND token = '6fLlY7tVraOLTKoevsIv79+k39pbyQG7eB1pNSKl358=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}